Metallic packing.



PATENTED NOV. 15, 1904.

I. A. MAGNUSSON. METALLIC PACKING.

APPLIOATION rum) we. 21. 1903.

N0 MODEL,

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7 UNITED STATES Patented November 15, 1904.

JOHN A. MAGNUSSON, OF TACOMA, WASHINGTON.

METALLIC PACKING.

SPECIFICATION forming part of Letters Patent No. 774,886, dated November 15, 1904.

Application filed August 27, 1903. Serial No. 170,957. (No model.)

To all whom it may concern.-

Be it known that I, JOHN A. MAeNUssoN, a citizen of the United States, residing in Tacoma, county of Pierce, and State of Washington, have invented certain new and useful Improvements in Metallic Packing, of which the following is a'specification.

My invention relates to devices for preventing the escape of steam or other vapor from a cylinder or other receptacle through the opening through which the reciprocating piston-rod passes, and has for its objects, first, the cheapening of the manufacture; second, the reduction of friction, and, third, the simplification rendering it easy to assemble. I attain these objects by the devices illustrated in the accompanyingdrawings, in which- Figure 1 is a vertical section through one form of my device. Fig. 2 is a similar section through another form, and Fig. 3 is a plan with the cover removed and indicated by dotted lines.

Similar letters of reference refer to similar parts throughout several views.

The cylinder-head A is provided with a hole B, through which the piston-rod O passes. This hole B should be of greater diameter than the rod O. The outside of the cylinderhead A is provided with a circular depression. as at D, concentric with the hole B. The plate E fits loosely into and over this depression D and is made with one or more circular rings F on its lower surface, said rings having a substantially triangular section, as shown. The upper face of the plate E is flat and is adapted to be engaged around its outer portion by the lower surface of the coverG, which is secured to the cylinder-head A by means of screws and which bears tightly against the plate E and presses the sharp angle of the rings F into close contact with the surface of the cylinder-head A. The plate E has a central hole corresponding to the hole B in the head A.

The cover G is provided with a central circular hole or recess made of two sections, the

lower section H being of greater diameter than the upper section I. These sections are concentric with the hole B and extend almost through the depth of the cover G.

Within the recesses H and I, I place my metallic packing. On the plate E and around the piston-rod O, I place the piece J, which consists of three similar parts so shaped that when they are put together they form a complete circle except for narrow spaces between each of the three parts, as shown in dotted lines in Fig. 3. The spiral spring K holds all the parts together, pressing them lightly against the piston-rod. On this piece J is placed a similar piece L of smaller diameter than the piece J. The spaces between the three parts of piece L are arranged so that they do not coincide with those of the piece J, as is clearly shown in Fig. 3.

Outside of the piece L and also on the piece J is the annular piece M, whose outside diameter is equal to that of the piece J and whose inside diameter is equal to that of the piece L, and its depth is equal to that of the piece L. This piece M is also formed of three parts and is arranged so that the spaces do not coincide with either those of the pieces J or L. Spiral spring K holds the parts of the pieces M and L together in the same way that the piece J is held.

The ring N which also rests on the plate E, is formed with its outside diameter equal to the diameter of the recess H, audits inside diameter is greater than the diameter of the pieces J and M, and its thickness or depth is equal to the sum of the depths of the pieces J and M.

Over the pieces L, M, and N is lair] the circular plate O, whose diameter is equal to that of the ring N and the recess H and which has a central hole the same size as the abovementioned hole B.

The depth of the recess H is such that the above-described pieces J, L, M, and N when assembled as above described and as shown in Fig. 1 will accurately fillthe recess.

Above the plate 0 are placed the pieces J L and M respectively, similar to the pieces J L, and M and held together by the spiral springs K. These pieces accurately fill (in depth) the recess I.

The cover G is placed over all the packing and is firmly bolted to the cylinder-head A.

The form of my packing illustrated in Fig. 2 is similar to that described, except that only one recess in the cover is used, and therefore the pieces N and O are dispensed with, and the recess need only be as large as the recess I above described.

Itwill be readily understood that my device provides a very easily made and assembled packing and that it is efiicient, and yet the pressure on the piston-rod is very light, reducing the friction to a minimum.

The steam cannot escape between the cylinder-head and the cover Gr, because of the sharp-edged rings F, which form a close joint. It may enter the recess H by way of the spaces between the parts of the piece J; but it can get no farther, because every joint is covered by the solid part of some other piece.

What I claim, and desire to secure by Letters Patent, is

In a metallic packing, the combination with a recessed cover, of an annular packing-ring fitting the piston-rod and being split radially, a second split annular packing-ring fitting the piston-rod andv resting on said first ring and being of smaller diameter than said first ring and breaking joints therewith, and a third split annular ring fitting outside of said second ring and resting on said first ring and breaking joints with both said first and second annular rings, all of said rings being compressed within the said recessed cover.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

JOHN A. MAGNUSSON.

Witnesses:

ELLIs LEWIS GARRETSON, FREDERIO J. SHAW. 

